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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A180272 a(n) = binomial(n, A002024(n+1)-1) where A002024 is "n appears n times".

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 6
5 10
6 20
7 35
8 56
9 84
10 210
11 330
12 495
13 715
14 1001
15 3003
16 4368
17 6188
18 8568
19 11628
20 15504
21 54264
22 74613
23 100947
24 134596
25 177100
26 230230
27 296010
28 1184040
29 1560780
30 2035800
31 2629575
32 3365856
33 4272048
34 5379616
35 6724520
36 30260340
37 38608020
38 48903492

List of values

[1, 1, 2, 3, 6, 10, 20, 35, 56, 84, 210, 330, 495, 715, 1001, 3003, 4368, 6188, 8568, 11628, 15504, 54264, 74613, 100947, 134596, 177100, 230230, 296010, 1184040, 1560780, 2035800, 2629575, 3365856, 4272048, 5379616, 6724520, 30260340, 38608020, 48903492]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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